Surface send_hello server errors from @urianchang

opcua/client/client.py

@@ -233,7 +233,9 @@ class Client(object):
         Send OPC-UA hello to server
         """
         ack = await self.uaclient.send_hello(self.server_url.geturl(), self.max_messagesize, self.max_chunkcount)
-        # FIXME check ack
+        # TODO: Handle ua.UaError
+        if isinstance(ack, ua.UaStatusCodeError):
+            raise ack
 
     async def open_secure_channel(self, renew=False):
         """

opcua/client/ua_client.py

@@ -82,7 +82,8 @@ class UASocketProtocol(asyncio.Protocol):
         elif isinstance(msg, ua.Acknowledge):
             self._call_callback(0, msg)
         elif isinstance(msg, ua.ErrorMessage):
-            self.logger.warning("Received an error: %r", msg)
+            self.logger.fatal("Received an error: %r", msg)
+            self._call_callback(0, ua.UaStatusCodeError(msg.Error.value))
         else:
             raise ua.UaError("Unsupported message type: %s", msg)